Can the U.S. Defend against a North Korean Missile Strike ?

Can the U.S. Defend against a North Korean Missile Strike ?

 
A flurry of recent missile tests by North Korea has set nerves on edge and stirred fresh concern about whether U.S. defenses could protect Americans against a sneak attack. North Korea has detonated nuclear devices and is trying to develop long-range missiles capable of reaching the United States.